> There 11mm head bolts holding the drums on to the hubs. Remove these and
> the drums can come off. They can be good and stuck though if they have
> been on there a while. Use a good penetrating oil and hope for the best.

Instead of penetrating oil, use a small hand sledge hammer  (mine is 2� lb) and
rap it firmly all around the outside of the drum. Angle the sledge slightly
outward. Works for me.
Larry